Precious stone



FIG. 1 is top plan view of a precious stone showing my new design;

FIG. 2 is a bottom plan view;

FIG. 3 is a front elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is side elevational view; and,

FIG. 6 is a bottom perspective view. 

CLAIM The ornamental design for a precious stone, as shown and described. 